Fireproofing textile material.



UNITED STATES PATENT OFFICE.

WILLIAM HENRY PERKIN, JR., OF MANCHESTER, ENGLAND, ASSIGNOR or- ONE-HALFTo WHIPP BROTHERS & TOD LIMITED, or MANCHESTER,

ENGLAND.

To all whom/it may concern: Q

Be it known that I, WILLIAM HENRY PER.- KIN, Jr., .Ph. D., F. R. S., asubject of the King of Great Britain and'Ireland,residing at g i OwensCollege, in the city of Manchester, in the county of Lancaster, England,professor of organic chemistry, have invented certain new and usefulImprovements in. Fireproofing Goods, of which the following is aspecification.

This invention relates to the treatment of raw cotton or cotton or otherfibrous or tex tile goods (and especially fiannelet) for rendering themless inflammable than hitherto by fixing an insoluble compound in thefibers of the material, so that they can be. repeatedly washed and stillretain their resistance to ignition.

My present invention consists in treating the goods first with salt(such as sodium stannale) containing the oxid of a metal in its acidradical, then drying, then treating the said goods with a metallic saltnot containing the oxid of a metal in its acid radical, but capable offorming an insoluble compound with the'stannate, and then dryingordryingand steaming the goods. An insoluble fireproofing compound is thusformed or deposited by precipitation directly in and upon the fibers ofthe goods, so that it neither washes out when the material is subjectedto domestic washingsnor crumblesout in wear.

\ For the first bath 1 use a stannate, preferably sodiumstannate. Asexamples of me; 3 5 tallic salts which do not contain-the oxid of ametal in their acid radicals, but which are capable of forming aninsoluble compound with the deposit from the firstbath, I mention solu-'ble salts of zinc, aluminium," copper, and 4o nickel, such as acetate ofzinc, acetate of aluminium, nickel.

The following .is an example of the way in which the process may becarried out in pracz i tice according to this invention, (the partsgiven in the example are by volume The goods are treated with a solutionof stain- Speci fication of Letters Patent? Application filed April 18,1902. Serial No. 103,637. (Specimena) 'ing zinc-acetate solution of 17Baum, and

sulfate of copper, and suli'ate of FIREIPROOFING TEXTILE MATERI L.

v Patented Feb. 12, 1907;

mate of soda of 1 6? Baum and are then dried and then treated with abath contain- 5o afterward the goods are dried or both dried andsteamed. An insoluble body consisting partly of stannic' acid, andpartly of a compound containing stannic acid is thus left in the fibersof thematerial after the second treatment. *By drying the first bath inthe material after impr gnation the stannate /is brought within or inclose contactwiththe fibers and does not wash away during the subsequenttreatment. comes at the same time permanently fixed in the fibers asstannic acid, the remainder-being afterward fixed (as an insolublecompound containing stannic acid) by the second bath.

I claim as my invention' 1. The process described. of fireproofingfibrous and textile materials, said process.

consisting in preparing two separate baths, the first bath being asolution'of a stannate,

and the second bath being a-solution of metallic salt free from the-oxidof a metal in its acidradical, but capable of forming an insolublecompound withthe stannate, saturating.

' thegoods' first with the stannate-bath, thendrying the oods, andafterward saturating the goodswith the aforesaid second bath,

and thereby forming an i-nsolublecompound upon the goods tomakethemfireproof, and finally drying, for'the purppse set forth.

-. 2. The process-described of fireproofing 8o.

fibrous and textile materials, said process consisting in first treatingthe same witha so lution of a stannate, then drying, and then treatingwith a solution of an acetate capable of forming an insoluble compoundwith the deposit from the first bath, and finally drying.

In testimony whereof I aflix my signature in presence of two Witnesses.

WILLIAM HENRY PERKIN, JUNIOR.

Witnesses:

WILLLIAM GERALD REYNOLDS, PERCY READ GoLDRm'c.

A portion of it be- 60

